added url field to activity and tests
added url field and replaced xml metadata with json metadata
removed definition field from json metadata
working on voided and statement filter behavior
Merge pull request #129 from ljwolford/1.0actupdate

1.0actupdate
Merge branch 'master' into voiding
added request to voidedStatementId
added 404 check on test_void to align with issue #152
Merge pull request #130 from creighton/voiding

Voiding behavior changes